CVE-2026-25550

CriticalCVSS 9.8

Published: 04/06/2026(UTC)Updated: 16/09/2026(UTC)Translated: 16/09/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

0.88%

57th percentile - higher than 57% of all known CVEs

Summary

Risk Assessment

An unauthenticated remote attacker could gain full control of the server with SYSTEM privileges, disclose credentials, or move laterally within the network. The risk is critical for organizations running BarTender 2010, 2016, or 2019.

Recommendation

Immediately upgrade BarTender to version 12.0.1 or later. Until patched, restrict access to TCP port 7375 at the firewall and monitor for unusual connections to this service.

Other vulnerabilities in BarTender

CVE-2026-25551High
Seagull Software BarTender 2021 R1 through 12.0.1 contains an insecure deserialization vulnerability that allows low-privileged local users to escalate privileges. The DataServiceSingleton .NET Remoting endpoint is bound to localhost on TCP port 7375, limiting the attack surface to local access only. The endpoint is configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. An attacker can send YSoSerial.NET-generated BinaryFormatter payloads to achieve code execution as NT AUTHORITY\SYSTEM. The vulnerability was corrected in BarTender 12.1.

Original NVD description (English source)

Seagull Software BarTender 2010, 2016, and 2019 contain an unauthenticated remote code execution vulnerability in the .NET Remoting service exposed on TCP port 7375 via BtSystem.Service.exe. The service registers an unauthenticated singleton endpoint — BarTenderSystem for BarTender 2016 <= R9, and DataServiceSingleton for BarTender 2019 <= R10 — configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. An unauthenticated remote attacker can exploit .NET Remoting object unmarshalling to read or write arbitrary files on the server using the .NET WebClient class, or coerce NTLMv2 authentication by supplying a UNC path to an attacker-controlled server, enabling sensitive credential disclosure, remote code execution, or lateral movement depending on service account privileges and network environment. The service runs in the context of NT AUTHORITY\\SYSTEM. This vulnerability is corrected in BarTender 12.0.1. Users of affected releases should upgrade to BarTender 12.0.1 or later.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS